State detection device for bearing roller, roller bearing device with sensor, and wind turbine generator

Abstract

A state detection device according to the invention includes a strain gauge that detects a physical state of a tapered roller, and a processing portion that obtains a detection signal that is output from the strain gauge, performs processing on the detection signal, and transmits detection data obtained by performing the processing on the detection signal, to an outside. The strain gauge and the processing portion are accommodated in a through-hole formed at an axis center of the tapered roller.

What is claimed is: 
     
       1. A state detection device that detects a physical state of a bearing roller that is rollably disposed between a first bearing ring and a second bearing ring, the second bearing ring being disposed concentrically with the first bearing ring, the state detection device comprising:
 a sensor that detects the physical state of the bearing roller; 
 a processing portion that obtains a detection signal that is output from the sensor, performs processing on the detection signal, and transmits detection data obtained by performing the processing on the detection signal, to an outside of the bearing roller, 
 the sensor and the processing portion being accommodated in a central hole formed at an axis center of the bearing roller, and 
 the processing portion being provided on a substrate, and the substrate being accommodated in the central hole in a state in which the substrate is not in contact with an inner surface of the bearing roller, the inner surface defining the central hole; and 
 a substrate retaining material that is interposed between the substrate and the inner surface defining the central hole, 
 the sensor being fixed to the inner surface defining the central hole, and the substrate retaining material being interposed between the sensor and the substrate. 
 
     
     
       2. The state detection device according to  claim 1 , wherein the processing portion includes a storage portion that stores the detection data obtained by performing the processing on the detection signal output from the sensor. 
     
     
       3. The state detection device according to  claim 2 ,
 wherein the substrate retaining material retains the substrate in the state in which the substrate is not in contact with the inner surface defining the central hole. 
 
     
     
       4. The state detection device according to  claim 3 , wherein the substrate retaining material is formed of a material having rigidity lower than rigidity of the substrate. 
     
     
       5. A roller bearing device with a sensor comprising:
 a first bearing ring; 
 a second bearing ring that is disposed concentrically with the first bearing ring; 
 a plurality of bearing rollers that is rollably disposed between the first bearing ring and the second bearing ring; and 
 a state detection device that detects a physical state of at least one of the bearing rollers, 
 wherein the state detection device is the state detection device according to  claim 3 . 
 
     
     
       6. A roller bearing device with a sensor comprising:
 a first bearing ring; 
 a second bearing ring that is disposed concentrically with the first bearing ring; 
 a plurality of bearing rollers that is rollably disposed between the first bearing ring and the second bearing ring; and 
 a state detection device that detects a physical state of at least one of the bearing rollers, 
 wherein the state detection device is the state detection device according to  claim 2 . 
 
     
     
       7. A wind turbine generator comprising:
 a main shaft having one end at which a rotor blade that receives wind power is provided so as to be rotatable together with the main shaft; 
 a generator that generates electricity by rotation force of the main shaft; and 
 a bearing device that supports the main shaft so that the main shaft is rotatable, 
 wherein the bearing device is the roller bearing device with the sensor according to  claim 6 . 
 
     
     
       8. The state detection device according to  claim 1 ,
 wherein the substrate retaining material retains the substrate in the state in which the substrate is not in contact with the inner surface defining the central hole. 
 
     
     
       9. The state detection device according to  claim 8 , wherein the substrate retaining material is formed of a material having rigidity lower than rigidity of the substrate. 
     
     
       10. A roller bearing device with a sensor comprising:
 a first bearing ring; 
 a second bearing ring that is disposed concentrically with the first bearing ring; 
 a plurality of bearing rollers that is rollably disposed between the first bearing ring and the second bearing ring; and 
 a state detection device that detects a physical state of at least one of the bearing rollers, 
 wherein the state detection device is the state detection device according to  claim 9 . 
 
     
     
       11. A roller bearing device with a sensor comprising:
 a first bearing ring; 
 a second bearing ring that is disposed concentrically with the first bearing ring; 
 a plurality of bearing rollers that is rollably disposed between the first bearing ring and the second bearing ring; and 
 a state detection device that detects a physical state of at least one of the bearing rollers, 
 wherein the state detection device is the state detection device according to  claim 8 . 
 
     
     
       12. A wind turbine generator comprising:
 a main shaft having one end at which a rotor blade that receives wind power is provided so as to be rotatable together with the main shaft; 
 a generator that generates electricity by rotation force of the main shaft; and 
 a bearing device that supports the main shaft so that the main shaft is rotatable, 
 wherein the bearing device is the roller bearing device with the sensor according to  claim 11 . 
 
     
     
       13. A roller bearing device with a sensor comprising:
 a first bearing ring; 
 a second bearing ring that is disposed concentrically with the first bearing ring; 
 a plurality of bearing rollers that is rollably disposed between the first bearing ring and the second bearing ring; and 
 a state detection device that detects a physical state of at least one of the bearing rollers, 
 wherein the state detection device is the state detection device according to  claim 1 . 
 
     
     
       14. A wind turbine generator comprising:
 a main shaft having one end at which a rotor blade that receives wind power is provided so as to be rotatable together with the main shaft; 
 a generator that generates electricity by rotation force of the main shaft; and 
 a bearing device that supports the main shaft so that the main shaft is rotatable, 
 wherein the bearing device is the roller bearing device with the sensor according to  claim 13 .